/// <summary>
/// Returns a string containing the full paths of the specified items.
/// </summary>
/// <param name="toolboxControl">The <see cref="TreeListBox"/> control.</param>
/// <param name="items">The items to examine.</param>
/// <returns>A string containing the full paths of the specified items.</returns>
private static string JoinItemFullPaths(TreeListBox toolboxControl, IEnumerable <object> items)
{
var fullPaths = new StringBuilder();
foreach (var item in items)
{
fullPaths.Append(toolboxControl.GetFullPath(item)).Append('\n');
}
return(fullPaths.ToString().TrimEnd());
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// PUBLIC PROCEDURES
/////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Initializes a <see cref="IDataObject"/> based on the specified items.
/// </summary>
/// <param name="sourceControl">The source control that contains the items.</param>
/// <param name="dataObject">The <see cref="IDataObject"/> to initialize.</param>
/// <param name="items">The items to examine.</param>
/// <returns>The <see cref="DragDropEffects"/> that specifies the allowed drag/drop effects for the <see cref="IDataObject"/>.</returns>
/// <remarks>
/// The default implementation of this method simply return <c>DragDropEffects.None</c>.
/// Override this method to initialize the <see cref="IDataObject"/> with text and/or other data formats
/// (such as <see cref="TreeListBox.ItemDataFormat"/> for supporting drag/drop),
/// and to return an appropriate <c>DragDropEffects</c> result.
/// </remarks>
public override DragDropEffects InitializeDataObject(TreeListBox sourceControl, IDataObject dataObject, IEnumerable <object> items)
{
if (sourceControl == null)
{
throw new ArgumentNullException("sourceControl");
}
if (dataObject == null)
{
throw new ArgumentNullException("dataObject");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
// Store the full paths to items in case we drop on the tree itself...
// Each item needs to have a unique path, which comes from adapter GetPath() calls
var fullPaths = new StringBuilder();
foreach (var item in items)
{
fullPaths.AppendLine(sourceControl.GetFullPath(item));
}
if (fullPaths.Length > 0)
{
dataObject.SetData(TreeListBox.ItemDataFormat, fullPaths.ToString());
}
// If there is one item, store its text so that it can be dropped elsewhere
if (items.Count() == 1)
{
var viewModel = items.First() as TreeNodeModel;
if (viewModel != null)
{
dataObject.SetData(DataFormats.Text, viewModel.Name);
}
}
return(DragDropEffects.Move);
}